Function Description
The Edit Node button in the Feature Editing group on the Edit Data tab provides functions for editing the vertices of a geometry, including: adding, deleting, and moving nodes.
A vertex represents a series of coordinate points used to describe a geometry in SuperMap. Text objects in SuperMap do not have vertices. The node editing function is only available for line and region objects.
Function Entrances
- Edit Data Tab -> Feature Editing Group -> General Editing -> Trimming -> Edit Node
Operating Steps
Editing Nodes
When the Edit Node button is selected, you can edit the nodes of the currently selected geometry in an editable layer on the map, including adding nodes, moving nodes, and deleting nodes.
The specific operating steps are as follows:
- Set the layer containing the geometry (line or region) you want to edit to an editable state on the map.
- Select a geometry (line or region) to edit. Currently, only one selected object can be edited at a time.
- In the General Editing drop-down menu on the Edit Data tab, click the Edit Node button to select it. At this point, the map's operation status changes to Edit Node, and all vertices of the selected geometry will be displayed.
- Add Node: Click with the left mouse button on the selected geometry to add a node.
- Move Node: Select a node on the geometry, press and hold the left mouse button, drag the mouse to move the selected node. Release the left mouse button to finish. The shape of the geometry will change after moving the node.
- Delete Node: Select a node on the geometry. You can hold down the Shift or Ctrl key to select multiple nodes continuously. Double-click the left mouse button or press the Delete key to delete the selected nodes. The shape of the geometry will change after deleting nodes.
Note:When performing delete node operations on sub-objects of complex objects (composed of two or more sub-objects):
- If the sub-object is a region object, and after deleting nodes, the remaining number of nodes is less than 3 (unable to form a closed region structure), the system will automatically delete that sub-object.
- If the sub-object is a line object, and after deleting nodes, the remaining number of nodes is less than 2 (unable to form a line structure), the system will automatically delete that sub-object.
- During the operation, users can directly select other geometries to perform adding, moving, and deleting node editing operations. If you click on a blank area of the map, the functions in Feature Editing become unavailable, and the mouse cursor automatically switches to the selection function. Selecting a geometry again will default to starting the Edit Node function. The Edit Node operation status will only terminate when the user switches the Edit Node button to a non-pressed state.
- To cancel the current map's Edit Node operation, simply click the Edit Node button again to deselect it, or right-click on the map.
Auto-align Editing Nodes
When users are performing edit node operations on line datasets and region datasets, they can enable Auto-align Editing Nodes. When this function is enabled:
- When dragging or deleting common vertices of multiple adjacent region objects, the adjacent region objects will automatically maintain their adjacency relationship. This avoids the need for repeated adjustments of nodes on adjacent objects and potential topology issues like gaps or overlaps, thereby improving user efficiency.
- When dragging or deleting common points of multiple adjacent line objects, the line objects sharing that point will automatically readjust their shape based on the new node position. This avoids the need for users to repeatedly move common points and prevents issues where points might not align after moving.
The specific operating steps are as follows:
- In the Drawing Settings of the Objects group on the Edit Data tab, click the Auto-align Editing Nodes button to select it. At this point, auto-coordination will be enabled during node editing.
- Move the mouse over the node you need to adjust on the map, press and hold the left mouse button to drag the mouse, or press Delete to delete the node. After editing the node, the geometric shapes of adjacent region objects will change while consistently maintaining their adjacency relationship. When editing a common point of multiple line objects, the line objects sharing that point will automatically readjust their shape based on the moved node position or the state after deletion.
- To stop auto-coordination, deselect the Auto-align Editing Nodes button. The automatic modification operation status will then terminate.
Related Topics